3.7V 80mAh LiPo 1S Polymer Battery: Headphone, Earphone, MP3, Watch - 301220
Built-in protection circuit (PCM) prevents over charging/discharging.
Actual measured dimensions (mm): D3.6 x W11.7 x L21.4
Shipped fast and secure from the UK (global shipping available).
If you have any questions at all, or if you don't see the battery you require, please ask.